With both parks we were only there (prior visits) for literally 3 days..WDW we were unable to go to the water parks. (we stayed at Polynesian with no dining plan). At Universal we also did not get to go to Sea World and other water related parks...That's why we chose 7 days..Although may do 5, 6 or 7 days..BUT no less than 7 day cruise. We want time to see other things.

My other question is if we went to Universal and decided to do Allure or Oasis we need to rent a car right? Transportation is not offered through RC correct?